Remote sensing systems

Details Remote sensing systems Remote sensing systems

1983-12-02

1988-08-02

Orsino, Jr., Joseph A.

Communications: electrical

Continuously variable indicating

With meter reading

340539, 34082569, G08C 1924

Patent

active

047616482

ABSTRACT:
A security installation comprises sensors arranged in and around a building which transmit digital information to a central station by radio, in each case preceded by an access code specific to the particular installation; signals inadvertently received from the sensors of an adjacent installation are rejected. The information is transmitted by encoding a multiple bit word incorporating the access code, a code identifying the particular sensor, and the actual data, using Manchester II coding on an FSK transmission. Each such word is sent several times to form a data packet. The master station tests the received data for the correct format and for the correct access code. Recognition is only complete when within a particular packet, at least two (say) sequential words and at least two other words are recognized.

REFERENCES:
patent: 3579190 (1971-05-01), Karras
patent: 3848231 (1974-11-01), Wootton
patent: 3852718 (1974-12-01), De Lyria
patent: 4020477 (1975-11-01), Holland
patent: 4186345 (1980-01-01), Marita et al.
patent: 4251812 (1981-02-01), Okada et al.
patent: 4358756 (1980-06-01), Morel et al.

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